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Distinguishing SFG and SHG using spectrally resolved FT-NLO. The excitation/detection map of the nonlinear signal from a hybrid gold/ZnO nanostructure demonstrates the existence of both SFG (evident by the off-diagonal signal at a detection axis of 4.8 fs–1) and SHG (observed in the on-diagonal signal at lower energies). Reprinted with permission under a Creative Commons Attribution 4.0 International License from ref (21). Copyright 2020 Springer Nature.
